How do I make an object flicker at specific times?
So let say you've created your object. Give it an Emission shader, create at least 1 keyframe at frame 1 with a value of 1 for example.



Open the Graph Editor (to switch from the Dope Sheet just press CtrlTab). Press N to open the right panel, click on the Modifiers tab and create a Noise modifier. Play with the parameters (Scale, Strength...). If you want the modifier to happen at a precise frame click on the Restrict Frame Range and set the Start and End values.